how would i solve this?

Question

how many grams of sugar would you need to have the same number of particles as 15.0 grams of table salt?

how exactly do i solve this? do i use avogadro's number as well?

Answer 1

To answer the second question first, you dont need Avagadros number.

The key to the answer is that you want the number of moles of sugar to be that of table salt. I dont have the periodic chart, so my answers might be a bit off. The mole weight of table salt (NaCl) is about 60. So the number of moles in 15 g is 15/60 or 0.25.

For sugar, you should specify the exact sugar. I will use C6H12O6 for the formula, which has a mole weight of 180. Then the weight is 0.25 x 180 or 45 grams

Answer 2

First you'll have to find the number of atoms present in your sample of table salt (NaCl) by multiplying the number of mols present by avagadro's number. Then you can do the reverse operation to convert that number of molecules back into grams of sugar.

good luck - and remember to check out the samples in your text book, they're there for a reason.